MyApp.Cldr.Unit.to_iolist-exclamation-mark

You're seeing just the function to_iolist-exclamation-mark, go back to MyApp.Cldr.Unit module for more information.

to_iolist!(number, options \\ [])

to_iolist!(
  Cldr.Unit.value() | Cldr.Unit.t() | [Cldr.Unit.t(), ...],
  Keyword.t()
) :: list() | no_return()

Formats a unit using to_iolist/3 but raises if there is an error.

list_or_number is any number (integer, float or Decimal) or a t:Cldr.Unit struct or a list of t:Cldr.Unit structs
options is a keyword list

:unit is any unit returned by Cldr.Unit.known_units/0. Ignored if the number to be formatted is a t:Cldr.Unit struct
:locale is any valid locale name returned by Cldr.known_locale_names/0 or a Cldr.LanguageTag struct. The default is Cldr.get_locale/0
:style is one of those returned by Cldr.Unit.available_styles/0. The current styles are :long, :short and :narrow. The default is style: :long.
:grammatical_case indicates that a localisation for the given locale and given grammatical case should be used. See Cldr.Unit.known_grammatical_cases/0 for the list of known grammatical cases. Note that not all locales define all cases. However all locales do define the :nominative case, which is also the default.
:gender indicates that a localisation for the given locale and given grammatical gender should be used. See Cldr.Unit.known_gender/0 for the list of known grammatical genders. Note that not all locales define all genders. The default gender is Cldr.Unit.default_gender/1 for the given locale.
:list_options is a keyword list of options for formatting a list which is passed through to Cldr.List.to_string/3. This is only applicable when formatting a list of units.
Any other options are passed to Cldr.Number.to_string/2 which is used to format the number

iex> MyApp.Cldr.Unit.to_iolist! 123, unit: :gallon
["123", " gallons"]